Someone who stumbles into a nest with blue eggs would be perplexed as to what kind of bird might be occupying the space.

Blue eggs are laid by five common bird species in the United States.

In the United States, blackbirds, dunnocks, song thrushes, magpies, and starlings are just few of the birds that produce blue eggs.

These are the most frequent species of bird in the United States that lay blue eggs, although there are more.

This small guide was put together to help you determine which birds lay Blue Bird Eggs based on their size and features.

The eggs of the robin are sometimes misidentified as blue when in fact they are a light buff color.

American Robin

Typically, a nesting American robin will lay three to five pale Blue Eggs.

Typical egg dimensions are a length of 2.8cm to 3cm (28mm to 30mm) and a width of around 2cm (20mm).


From March through July is when common blackbirds (Eurasian blackbirds) typically lay their blue eggs, generally between three and five.

The eggs have an average width of 22mm and a length of 29mm, and they have a bluish green color with red speckles.

Song Thrush

The glossy light blue eggs of a Song Thrush are speckled with black or purple.

Their typical dimensions are 21 mm in width and 27 mm in length.


The Dunnock can often mistake for the more common House Sparrow.

A clutch of 4-5 eggs will be laid by the female, and they will be a glossy blue color with some reddish spotting.

At 14 mm across and 19 mm in length, they are little.


When seen from a distance, starlings seem to be black birds;

Nevertheless, upon closer inspection, their plumage reveals stunning iridescent sheen.

Over the course of many days, a female starling will lay two to nine eggs that range in color from white to light blue or green.

They measure around 21mm in width and 30mm in length.


Within the United States, magpies are widespread.

They deposit eggs that are blue green with brown spots, very unlike those of the blackbird.

They measure around 24mm in breadth and 35mm in length, making them much larger than a blackbird.

House Finch

House finches sometimes utilize nest boxes, and when they do, they lay eggs that are a delicate blueish-green with speckling.

From around the end of March until the end of July (give or take), they will typically lay anywhere between four and five eggs.

Carrion Crow

Large, all-black birds, carrion crows are solitary creatures.

They deposit their eggs in the forks of trees throughout the months of April and May.

Soft greenish blue, marked in brown and grey

4.3 x 3cm

Bluebirds Have Sometimes Nested Without A Cavity.

Bluebirds may build cup-shaped nests on ground banks and in thick branch forks, according to literature.

Allaire (1976) found a nest on surface-mined Kentucky soil.

Sprunt (1946a) reports bluebird nests on oak limbs near Clemson, South Carolina,

And in Alabama’s longleaf pine (Pinus palustris) woodlands.

When Do Bluebirds Build Their Nests

Blue Bird Eggs that winter in their territory, such as those in the warm Midwest and the southern states,

Begin constructing nests sooner than their northern and southern counterparts.

Nesting season for resident year-round birds begins in February and March,

Coinciding with the arrival of migrating Bluebirds in the northern states.

Blue Bird Eggs in Michigan and Minnesota begin constructing their nests in late March or early April.

When Does Egg Laying Begin

It takes the female Bluebird around 6–7 days after the nest is finished to start producing eggs.

The time of nest construction correlates with the general timing of egg-laying over the Blue Bird Eggs range.

Southern states with milder climates start producing eggs in February and March,

Whereas northern states with colder climates start laying eggs in April.

Bluebirds that are able to reproduce often have eggs in the nest by the month of April.

Female Bluebirds Lay How Many Eggs

Blue Bird Eggs usually have clutch sizes of between 4 and 5,

However sometimes they may produce as many as 7 eggs.

Each day, the female lays one egg.

Very seldom, you’ll find a nest with eggs laid by two different mothers.

They are both responsible for incubating and feeding the eggs or chicks.

How long is the breeding season?

Breeding seasons for bluebirds run anywhere from 83 days to over three months on average,

However this varies greatly within the species’ range.

When Do Bluebirds Abandon Their Eggs

Bluebirds usually leave their eggs for good reasons. If one parent dies,

A married Bluebird couple is more likely to leave their eggs, according to field observations.

Extreme weather and hunger contribute.

Extreme weather causes food shortages.

Cold weather reduces bug development, making them less mobile and difficult for bluebirds to discover.

Blue Bird Eggs must spend more time hunting for food, disregarding the eggs, or even temporarily relocating to food sources.

Another motive is predatory pestering.

Predators may constantly try to enter the next box.

Despite failing, harassment may prevent the female from incubating the eggs.

Why Do Some Bluebird Eggs Fail To Hatch

There might be many reasons.

Sometimes the reasons an egg fails to hatch remain a mystery.

Too high or low of temperatures, pesticide exposure,

Genetic abnormalities, and bacterial infections are some of the most likely causes.

Blue Bird Eggs and young birds have a tough time surviving in the cold.

Bacteria may have entered the egg during the process of ovulation in the female.

Once a Blue Bird Eggs has been laid, bacteria continue to multiply and destroy it.

What Are The Main Bluebird Egg Predators

The Blue Bird Eggs may be damaged by predators such as house sparrows, wrens, and woodpeckers.

Fire ants are a dangerous predator that may kill young birds.

Cats, raccoons, and snakes are all predators that will devour anything from an egg to a fully grown adult bird.

Author Bio

My name is Emma Perez, and I have a keen interest in the field of writing. I have written a couple of articles on various gemstones, fashion and would love to express my opinion on more such stones. Hope it has maximized your knowledge of gemstone jewelry and satisfied your quest to buy turquoise jewelry from an authentic place. We believe in quality and offer the same in our information and products.

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